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Period 12: repeat [1,1,1,1,0,0,-1,-1,-1,-1,0,0].
2

%I #17 Sep 08 2022 08:45:48

%S 1,1,1,1,0,0,-1,-1,-1,-1,0,0,1,1,1,1,0,0,-1,-1,-1,-1,0,0,1,1,1,1,0,0,

%T -1,-1,-1,-1,0,0,1,1,1,1,0,0,-1,-1,-1,-1,0,0,1,1,1,1,0,0,-1,-1,-1,-1,

%U 0,0,1,1,1,1,0,0,-1,-1,-1,-1,0,0,1,1,1,1,0,0

%N Period 12: repeat [1,1,1,1,0,0,-1,-1,-1,-1,0,0].

%C a(n+2) is the Hankel transform of A110199. - _Paul Barry_, Jun 23 2010

%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (0,1,0,-1).

%F G.f.: (1+x)/(1-x^2+x^4).

%F a(n) = a(n-2)-a(n-4). - _Wesley Ivan Hurt_, May 09 2021

%t LinearRecurrence[{0,1,0,-1}, {1,1,1,1}, 50] (* _G. C. Greubel_, May 14 2016 *)

%o (Magma) &cat [[1,1,1,1,0,0,-1,-1,-1,-1,0,0]^^10]; // _Vincenzo Librandi_, May 15 2016

%Y Cf. A010892 (bisection).

%K easy,sign

%O 0,1

%A _Paul Barry_, Oct 13 2009

%E Incorrect comment removed - _R. J. Mathar_, Oct 02 2012